//go:build darwin

package osthread

import "github.com/ebitengine/purego/objc"

func onmainthread() bool {
	return objc.Send[bool](objc.ID(cls_nsthread), sel_isMainThread)
}

var (
	cls_nsthread      objc.Class
	cls_nsapplication objc.Class
	cls_nsapp         objc.Class

	sel_isMainThread      objc.SEL
	sel_sharedApplication objc.SEL
	sel_run               objc.SEL
)

func init() {
	cls_nsthread = objc.GetClass("NSThread")
	cls_nsapplication = objc.GetClass("NSApplication")
	cls_nsapp = objc.GetClass("NSApp")

	sel_isMainThread = objc.RegisterName("isMainThread")
	sel_sharedApplication = objc.RegisterName("sharedApplication")
	sel_run = objc.RegisterName("run")

	// Just a bit of magic
	objc.ID(cls_nsapplication).Send(sel_sharedApplication)
	objc.ID(cls_nsapp).Send(sel_run)
}